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Distress signalsQuestion 279 of 352

Which Morse code group is a distress signal?

  1. Three dots, three dashes, three dots (SOS)
  2. One dot, one dash
  3. Three dashes only
  4. Two dots, two dashes
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Correct answer: Three dots, three dashes, three dots (SOS)

SOS in Morse code is a distress signal sent by any method.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 87: Annex IV: Distress Signals, § 87.01 Need of assistance

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Questions last reviewed: 18 October 2026